<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
</head>

<body>
    <div id="app">
        <h1>{{msg}}</h1>
    </div>
    <script src="vue-2.4.0.js"></script>
    <script>
        let vm = new Vue({
            el: "#app", //声明vue的代码作用的范围
            data: {
                msg: "hello world",
            },
            methods: {},
        });
        //new Vue中的可以放的这些属性都叫选项对象
    </script>
</body>

</html>